Casing for pipes



( 0 Model.)

W. H. AINSWORTH.

CASING FOR PIPES.

No. 340,073. Patented Apr. 20, 1886.

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WVILLIAM I1. AIXS\VORTH, OF "ILMIXGTOX, DELAVARE.

CASING FOR PIPES.

EPECIFICATION forming part of Letters Patent No. 340,073, dated. April 20, 1886.

(No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM H. AINS- WORTH, a citizen of the United States, residing at Wilmington, in the county of New Gastle and State of Delaware, have invented certain new and useful Improvements in Pipe- Oasings; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

The object of this invention is to provide an improved protecting-casing for water and other pipes which shall be easily put together, and which shall be simple and cheap in construction.

In the drawings, Figure 1 is a side view of the casing. Fig. 2 is a cross-section thereof in a plane indicated by the line 2 2 in Fig. 1. Fig. 3 is a similar section showing the casing packed. Fig. 4 is an enlarged section showing the locking device more clearly, and Fig. 5 is a detail view of one of the temporary retaining-springs.

Like letters designate corresponding parts in all of the figures.

The casing is made up of cylindrical sections A A of sheet metal. Each of these sections is made up of two half-cylinders, B B, which are placed around the pipe, 0, to be inclosed, with their edges meeting. Adjacent sections A A overlap each other, as in the case of ordinary stove-pipe sections, beads or flanges a a on them holding them in position. Each half-section B has bent edges b b, which are either turned inward, as shown at the left in Fig. 4, or outward, as shown at the right in the same figure. The adjacent edges of the halves of each section are bent in the same manner, and when the several sections A A are put together they are so placed that their bent edges form continuous lines.

In order to lock the two halves of each section together, and at the same time fasten adjacent sections together,-locking-keys D are provided. These keys consist of strips of sheet metal, the two edges 0 c of which are bent over toward each other, leaving a slot, (1, between them. These keys are slipped endwise over adjoining bent edges 1) b of the halfsections B B, the bent edges 0 c of the key. passing between the edges 12 b and the bodies of the half-sections, and the portions 6 e, conmeeting the bent portions b b to the bodies of the halfsections, passing through the slot d. \Vhere the joints occur between adjacent sections the keys are slipped by the joint, thus locking the two parts of each of the adjacent sections, and at the same time holding the, sections together.

When the casing has thus been put around. the pipes, the space between them is filled with a suitable non-conducting packing, such as asbestus or mineral wool. To hold the easing in position concentrically around the pipes while the packing is being introduced, sheetmetal springs E E are employed. Each of these springs is formed out of one piece of metal, and has a curved bottom portion, j, which conforms to the curve of the sections A, a radial portion, 9, springing from said base portion, a top portion, h, curved to conform to the pipe 0, and a second radial portion, 1', extending from the top portion down toward the base portion. Normally the spring of the metal holds the radial portion z away from the base portion f. The radial portion 1' also limits the movement of the side f, and prevents the same from being bent downward by the weight of the casing. The length of the base portion is less than the semicireumference of the casing. To retain the unfilled end of a section of the casing in position, two of these springs E E are used on opposite sides of the pipe 0. They are inserted by depressing the top portions, when they can be readily put in place between the pipe and casing, and upon releasing the top portions they spring up against the pipe and hold the casing centrally around it. \Vhen the space has been filled, these springs are removed, another section of the casing is put around the pipe and locked, and the springs are inserted in the open end of that section.

In order to permit access to the joints of the pipe C without removing the casing, they are left-exposed, and the casing is reduced at these points by a reduced section, F. This section is conical in shape, being at its smaller end of the diameter of the pipe 0, and expanding at its larger end to the dimensions of the rest of the casing. This reduced section is composed of two parts, B B, which are locked together in the same manner as those of the cylindrical sections. 7

In filling the space between the casing and inclosed pipe with asbestus, mineral wool, or other light non-conducting material, it is sometimes found dangerous to havethe light nonconducting material brought in direct contact with the pipe. the pipe is first wrapped with one or more layers, G, of asbestus paper, or other close non-conducting inflammable wrapping, and then the remaining space between the pipe thus wrapped and the outer casing is filled with the light filling material H.

I claim as my invention- 1. A pipe-casing composed of cylindrical sections A A, placed end to-end,each'section being composed of two similar semi-cylindrical portions, B B, which are put around the pipe to be inclosed, with their longitudinal edges b b in contact, the adjoining longitudinal edges b b of said half-cylinders being bent away from each other in opposite directions,

in combination with elongated locking-keys D D, having oppositely-bent edges 0 c, which take under the adjoining edges b b of the halfcylinders B B, said keys also lapping by the To guard against this danger joints between adjoining sections. A A, with their bent edges taking under the bent edges b b of said adjoining sections A A, whereby said sections A A and the half-cylinders B B of each section are locked together, substantially as set forth.

2. The casingand the inclosed pipe, in combination with temporary unattached holdingsprings, said springs having .concentric portions which rest against the surfaces ofsaid casing and pipe, respectively, substantially as Set forth. V

3. The casing A and the inclosed pipe 0, in

combination with temporary unattached holding-springs E E, each of said springs having a curved side, f, which fits against the inner surface of the casing A, a curved side, h,-which fitsagainst the outer surface of. the pipe 0, a

In testimony whereof I aflix my signature inpresence of two witnesses.

WILLIAM H. AINSWORTH.

Witnesses:

HENRY C. CONRAD, FRANK UHANDLER. 

